Insurance - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Apr. 30, 2018	Jan. 31, 2018	Apr. 30, 2018	Apr. 30, 2017
Schedule of Other Liabilities [Line Items]
Self insurance retention amount per-claim	$ 1,000,000		$ 1,000,000
Insurance policy coverage, general and automobile liability losses	200,000,000		200,000,000
Insurance policy coverage, property damage	75,000,000		75,000,000
Change in reserves for insurance claims	2,000,000	$ 2,000,000		$ 10,000,000
Increase in Claims Reserve	4,000,000		4,000,000
Insurance reserve adjustment, amount less than prior year adjustment			(6,000,000)
Minimum
Schedule of Other Liabilities [Line Items]
Primary policy limit	1,000,000		1,000,000
Maximum
Schedule of Other Liabilities [Line Items]
Primary policy limit	5,000,000		5,000,000
Self insurance retention amount per-claim, medical plan	$ 400,000.0		$ 400,000.0